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Texas Instruments SN74ACT574PW
- Part No.:
- SN74ACT574PW
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74ACT574PW.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,576
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Product details
Overview
SN74ACT574PW from Texas Instruments is an octal D-type edge-triggered flip-flop with 3-state outputs, operating at 4.5V–5.5V VCC, featuring 9ns max propagation delay at 5V, TTL-compatible inputs, and ±24mA output drive capability. It serves as a bus-oriented register for data latching and bidirectional bus interfacing in digital control systems.
For engineers reviewing the SN74ACT574PW datasheet, SN74ACT574PW pinout, SN74ACT574PW application, or SN74ACT574PW equivalent, this page delivers verified functional identity, TSSOP-20 package mapping, timing and drive specifications, real-world use cases in bus buffering and I/O port expansion, and two validated alternative parts with documented functional and application differences.
Technical Context
The SN74ACT574PW implements eight independent D-type flip-flops synchronized to the rising edge of CLK, with asynchronous 3-state control via active-low OE. Its architecture supports simultaneous data capture and high-impedance bus isolation without affecting internal state retention.
It operates within –40°C to +85°C ambient temperature, supports 100MHz max clock frequency at 5V, and maintains logic-level compatibility across TTL and 5V CMOS interfaces. Input transition rate is specified at ≤20 ns/V to ensure reliable setup/hold timing compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 4.5V to 5.5V - Ensures stable operation across industrial-grade 5V supply tolerances. |
| Max tpd | 9ns at 5V - Enables high-speed data latching in sub-100MHz synchronous bus systems. |
| IOL/IOH | ±24mA - Drives standard 50pF loads directly without external buffers in backplane or PCB trace applications. |
| Input Compatibility | TTL-voltage compatible - Accepts 0.8V/2.0V logic thresholds, enabling direct interface with legacy TTL logic families. |
| Operating Temperature | –40°C to +85°C - Qualified for industrial ambient environments without derating. |
| ESD Rating (HBM) | ±2000V - Meets JEDEC JS-001 for robust handling in automated assembly and field service. |
| Power Dissipation Cap. | 40pF - Predictable dynamic power consumption under 1MHz switching with 50pF load. |
Pinout & Package
TSSOP-20 (PW) package: 6.50mm × 6.4mm body size, 1.2mm max height, 0.65mm lead pitch, gull-wing leads, RoHS-compliant NiPdAu finish, MSL Level-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Active-low output enable | Asserting low places all Q outputs in high-impedance state; does not affect internal flip-flop state. |
| 2–9 (D1–D8) | Data inputs | Asynchronous inputs sampled on rising CLK edge; TTL-compatible voltage thresholds. |
| 10 (GND) | Ground reference | Primary return path for logic and output current; requires local 0.1µF bypass capacitor. |
| 11 (CLK) | Clock input | Rising-edge triggered; minimum pulse width 3ns ensures reliable edge detection. |
| 12–19 (Q8–Q1) | 3-state outputs | Output order is reversed (Q8=pin12, Q1=pin19); each drives ±24mA with 0.36V VOL @ 24mA. |
| 20 (VCC) | Positive supply | Must be decoupled locally; supports 4.5–5.5V range with <40µA quiescent ICC at 5.5V. |
Key Features
| Feature | Design Value |
|---|---|
| Edge-triggered D flip-flops | Eight independent channels latch data synchronously on CLK rising edge, eliminating metastability in multi-bit bus transfers. |
| 3-state output control | Single OE pin enables/disables all outputs simultaneously, supporting time-multiplexed bus sharing without external logic. |
| High-drive 3-state outputs | ±24mA drive strength allows direct connection to 50pF loads or stubbed transmission lines up to 10cm on FR-4 PCBs. |
| TTL-compatible inputs | Accepts 0.8V/2.0V thresholds, enabling seamless integration with 74LS, 74F, and other legacy TTL families without level shifters. |
| Low propagation delay | 9ns max tpd at 5V supports 100MHz clocking in high-throughput data acquisition and control register applications. |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
|
Use Scenario: Adding parallel digital I/O to a programmable logic controller using a 20-pin ribbon cable interface. IC Role / Device Role / Timing Role: Acts as an output latch and input buffer register, isolating field-side signals from the controller's internal bus during configuration changes. Use Value: Enables hot-swappable I/O modules by holding last valid state during OE assertion, preventing bus contention during module insertion/removal. |
Use Scenario: Bridging a microcontroller's 8-bit data bus to a legacy ISA-style peripheral requiring separate address/data strobes. IC Role / Device Role / Timing Role: Latches address bytes during memory-mapped I/O cycles while allowing data bus reuse for read/write operations. Use Value: Eliminates need for discrete transceivers or pull-up networks due to integrated 3-state drive and TTL compatibility. |
| Test Equipment Digital Pattern Generator | Embedded System Working Register |
|
Use Scenario: Generating precise, synchronized 8-bit stimulus patterns for IC functional testing in ATE systems. IC Role / Device Role / Timing Role: Stores pattern words from a sequencer and releases them on CLK edges with sub-10ns timing accuracy. Use Value: Achieves deterministic setup/hold margins (tsu=2.5ns, th=1ns) critical for high-reliability test vector delivery. |
Use Scenario: Holding intermediate computation results in a resource-constrained 8-bit microcontroller system with limited RAM. IC Role / Device Role / Timing Role: Functions as external working register bank, accessed via GPIO-controlled OE and CLK. Use Value: Provides deterministic 9ns latency and noise-immune storage, improving real-time response over software-managed RAM buffers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74ACT574PWR | Same die, identical electrical specs, TSSOP-20 tape-and-reel packaging (2000 pcs/reel), active production status. | Designed for automated SMT placement; same footprint and thermal profile (RθJA = 126.2°C/W) as SN74ACT574PW. | Select SN74ACT574PWR for volume production; SN74ACT574PW is obsolete but may be available in legacy tube stock. |
| SN74LVC574APW | Lower VCC range (1.65–3.6V), 3.3V logic only, 6.7ns tpd, ±24mA drive, same TSSOP-20 package. | Requires level translation when interfacing with 5V buses; unsuitable for mixed-voltage systems without translators. | Choose SN74LVC574APW only in pure 3.3V domains; SN74ACT574PW remains necessary for 5V-tolerant or mixed-signal bus interfaces. |
Compared with SN74ACT574PWR, the SN74ACT574PW shares identical functionality but lacks tape-and-reel support; versus SN74LVC574APW, it provides native 5V operation and TTL compatibility-critical for legacy system upgrades where voltage translation adds cost and board area.
Availability
SN74ACT574PW is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, test equipment digital pattern generation, and embedded system working registers requiring stable component supply and long-term obsolescence management.
Supply support for SN74ACT574PW includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions, with over 90 years of innovation in industrial, automotive, and communications markets.
The SN74ACT574PW belongs to TI's ACT (Advanced CMOS Technology) logic family, designed for high-speed, 5V-tolerant digital interfacing in industrial control, instrumentation, and legacy system modernization applications.
FAQ
What is the maximum clock frequency supported by the SN74ACT574PW?
The SN74ACT574PW supports a maximum clock frequency of 100MHz at VCC = 5V, as specified in the timing requirements table. This is achievable under recommended operating conditions (–40°C to +85°C, 4.5V–5.5V supply) with proper layout and load management. The device's 9ns max propagation delay and 3ns minimum clock pulse width enable reliable operation at this rate in well-designed systems.
Does the SN74ACT574PW support 3.3V logic levels?
No, the SN74ACT574PW is not rated for 3.3V-only operation. Its VCC range is strictly 4.5V to 5.5V, and its inputs require TTL-compatible thresholds (VIL ≤ 0.8V, VIH ≥ 2.0V). Applying 3.3V logic signals may result in unreliable switching or increased static current. For 3.3V systems, consider the SN74LVC574APW instead.
How does the output-enable (OE) pin function in the SN74ACT574PW?
In the SN74ACT574PW, the OE pin is active-low and controls all eight outputs simultaneously. When OE is high, outputs enter high-impedance (Hi-Z) state regardless of CLK or D inputs; when OE is low, outputs reflect the latched Q states. Critically, OE has no effect on internal flip-flop operation-data can be clocked in or retained while outputs remain disabled.
What is the thermal resistance (RθJA) of the SN74ACT574PW in its TSSOP-20 package?
The SN74ACT574PW in the PW (TSSOP-20) package has a junction-to-ambient thermal resistance (RθJA) of 126.2°C/W, as measured under standard JEDEC test conditions. This value assumes a two-layer PCB with minimal copper pour; actual performance improves with internal ground/power planes and thermal vias. No derating is required below 85°C ambient.
Can the SN74ACT574PW drive standard 50Ω transmission lines directly?
No, the SN74ACT574PW is not designed for direct 50Ω line driving. Its outputs are optimized for capacitive loads up to 50pF and resistive loads down to ~200Ω (based on ±24mA drive into 0.36V VOL). For controlled-impedance traces, use series termination (e.g., 33Ω resistor at source) or dedicated line drivers to prevent reflections and overshoot.
SN74ACT574PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74ACT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 110 MHz
- Max Propagation Delay @ V, Max CL:
- 11ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 24mA, 24mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 4.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
SN74ACT574PW FAQ
1.How can I place an order for SN74ACT574PW through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74ACT574PW on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74ACT574PW reliable?
The price and inventory of SN74ACT574PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74ACT574PW is usually 5 days.
3.What payment methods are accepted for SN74ACT574PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74ACT574PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74ACT574PW?
SN74ACT574PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74ACT574PW order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74ACT574PW?
For technical support, including SN74ACT574PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74ACT574PW requirements.
6.How does Aetrix verify that SN74ACT574PW is sourced from the original manufacturer or authorized distributors?
All SN74ACT574PW products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74ACT574PW meets industry standards.
7.What is the process for return or replacement of SN74ACT574PW?
All SN74ACT574PW units undergo pre-shipment inspection (PSI). If there is an issue with SN74ACT574PW, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74ACT574PW part is unused and in its original packaging.
Return procedure for SN74ACT574PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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